Phylogenies and Tree-Thinking by David Baum & Susan Offner The American Biology Teacher April, 2008 PowerPoint presentation compiled by Larry Flammer, ENSI webmaster From Phylogenies & Tree-Thinking. David A. Baum and Susan Offner. The American Biology Teacher, 70(4), With the kind permission from the National Association of Biology Teachers and David Baum.

Figure 1 Hypothetical genealogy of local population of plants

Fig. 2. How genealogy of sexual population is included in a phylogenetic tree

Fig. 3. Tree diagram is meant to represent an actual history of evolutionary lineages that have branched over time

Fig. 4. Four trees, all depict same evolutionary history

Fig. 5. Some important terms used to describe phylogenetic trees

Fig. 6. How to read a tree in terms of evolutionary relationships

Fig. 7. Three trees, all depict the same evolutionary history

Fig. 8. A clade includes all and only the descendants of a paticular ancestor

Fig. 9. How trees show evolutionary history